Myford big bore collet chuck and adaptor to small bore 2pc fittings M42 x 2.5
From Myford ltd. backplate thread of m42 x 2.5. backplate has m42 x 2.5mm thread, front plate is 1-1/8" x 12tpi. 2pc Big bore collet chuck. both collet chuck and adaptor need machining for precision and accuracy.